Re: "as right as rain"

Derek: It occurred to me that very many of our common phrases and
sayings come from a time, not long ago, when the majority of people
in the U.S. and Europe still lived in contact with nature. Only
a couple of generations ago, most agriculature depended on rain,
since irrigation was not so prevalent. The life of everyone in society
(or in the nearby village or town opr city) depended on the success
of the local crops, which in turn depended on spring and summer
rains. Rain was essential to survival. No crops equalled famine.

"Right as rain" just means needed, appropriate, essential, or hoped-for.